Gas-governor for type-machines and the like.



No.856,815, PATENTED JUNE 11, 1907.

0. w. SEAWARD;

GAS GOVERNOR FOR TYPE MACHINES AND THE LIKE.

APPLICATION FILED I'EB. 26, 1906.

\X/ITNESS E5:

261106116 3/ @WPMM UNITED STATES ra'rnrrr OFFICE.

CHARLES W. SEAWARD, OF MALDEN, MASSACHUSETTS, ASSIGNOR TO 0. W.

SEAWARD COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed February 26, 1906- Serial No. 302,858-

To all whom it may concern.-

Be it known that I, CHARLES W. SEAWARD, a citizen of the United States,residing at Malden, in the county of Middlesex and State ofMassachusetts, have invented a certain new and useful Improvement inGas-Gov ernors for Type-Machines and the Like, of which the following isa specification, referencebeing had therein to the accompanyingdrawings.

The invention relates to a new and useful method of and apparatus forregulating the temperature of molten metal or heated liquid which isheated by gas or steam or other means in which the source of heat passesthrough a pipe.

The invention is specially intended for application to machines formaking type in which the metal is melted in a pot and run out asdesired, it being important to maintain the molten metal at as nearly auniform temperature as possible, preferably about 510 degrees.

It is a somewhat common thing to have the gas pass through a tube havingan outlet passage to the burner which may be more or less closed by therise and fall of mercury in a chamber into which the gas tube dips, but

in all such apparatuses so far as known to me the mercury chamber ortube has been exposed to the direct heat of the burning gas, and thesupply of gas is varied according to the heat generated in the mercurychamber directly by the gas irrespective of the temperature of themetal. In other words, it serves to regulate the supply of gas and keepit constant within certain limits, and may or may not keep the moltenmetal at a fixed temperature. f the quantlty of'the molten metal in thepot was a ways the same, and if there were no outside influences toaffect the tem erature of the metal, the old method wou d work fairlywell, but where the quantity of the molten metal varies, a greatersupply of gas is required to keep the metal at a given temperature whenthe pot is full than when the. pot is only half full, and where thetemperature of the atmosphere varies or from other causes a largersupply is required to maintain an even temperature of the metal, theoldmethod fails. Therefore the end to be sought is not to maintain aconstant fixed supply of gas, but to maintain a fixed temto raise thetemperature, t esupp y of gas will be reduced to the necessary amount.

The object of the present invention is to have the temperature of theliquid directly and automatically control the supply of gas, and theinvention consists in having the rise and fall of the mercury controlthe size of the feed aperture for the gas and have the mercury tube dipinto the heated li uid so that the rise and fall of the mercury s all beilirecgly controlled by the temperature of the iqui The. invention willnow be fully described, reference being had to the accompanyin drawings,and the novel features thereof wil be particularly pointed out in theclaims at the end of the specification.

In the drawin s,Figure 1 is a side elevation, artly bro en away, of anapparatus embo ying the invention. Fig. 2 is a vertical section indetail on a larger scale than Fig. 1 showing the mercury tube andgovernor chamber. Fig. 3 is a vertical section of the governor chamberon a still larger scale. Fi 4 is a cross section on line 44 of Fig. 3.

n the drawings,1 is a metal pot provided with a jacket 2 having a cover3' and suitable supports and vents and draw hole of well knownconstruction, all of which do not form a part of the present inventionbut simply illustrate one form of machine with which apparatus embodyingthe invention is adapted to be employed.

4 represents the molten metal in the metal ot. p Amercury tube 5closedat the lower end terminates at its upper end in a shell or head 6which for convenience of construction is what larger n diameter than thelower portion which connects with the tube 5.

When there is heat on, the mercury 22 should fill the tube to about theline"23 shown in Figs. 2 and 3 covering the lower end of the tube 10,but not entirely covering the slits 21.

The top member 8 is a tubular shell having a bore of varying diameters.It is tapped out at its lower end of large enough diameter to screw ontothe threaded upper end 7 of the head of the mercury tube and forms atight joint. The upper portion of the bore of the shell 8 is tapped outfor screw threaded connection with a hollow adjusting tube 10.

The tube 10 is closed at its upper end. It is open at its lower end andthe bore 24 extends up to some point above the side port 11. In the sideof the tube 10 is a port 11 leading out from the interior bore of thetube. The shell 8 is formed with an annular chamber 12 with which theport 11 will register, the said chamber being of sufficient length topermit adjustment of the tube 10 up and down somewhat and still be sureof the port 11 always opening into said chamber. OD the side of theshell 8 is a nipple 14 having a passage 13 connecting with the inletport 11, and the nipple has connection with the gas supply tube 15.

At some distance below the annular cham ber 12 is another .annularchamber 16 provided with an exit port 17 which is connected by a nipple18 with a gas tube 19 leading to the burner 20 beneath the metal pot.

The lower portion of the tube 10 below the threaded portion is ofreduced diameter where it passes through the annular chamber 16. Thelower end of the tube 10 is open, and also there are one or more slits21, preferably two, in the sides of the tube extending back from theopen end so that when the mercury closes the end of the tube there willstill be an outlet for the gas through the slits.

The tube 10 being screw threaded is adj ustable longitudinally byturning so as to adjust the end of the tube relatively to the level ofthe mercury. It may be turned by hand, or by a pin inserted in the hole25 in the solid upper end of the tube.

When the mercury is cold the level should stand at some distance belowthe lower end of the tube.

The gas enters through the main supply pipe 15 and port 13 into theannular chamber 12, thence through the port 11 into the valve tube 10,and passes down through the tube 10, and out into the chamber 16, thencethrough port 17 and nipple 18 to tube 19 which leads to the gas burner20.

When the mercury is cold, the level being below the tube 10, the gasWill flow freely through the end of the tube 10, and liberally supplythe burner.

As the metal in the pot becomes heated, the mercury tube will alsobecome heated and the mercury will rise, closing the mouth of the tube10, and reducing the supply of gas to the small quantity that can passThis can be easily regu begins to fall, the mercury will begin to dropand permit a larger flow of as before the temperature of the metal hasdropped to any great extent, thus causing a larger flame and raising thetemperature again, or counteracting the tendency to drop. By this meansthe tem erature of the molten metal in the pot is se if governing andcan be maintained constant within a very small margin, whatever be thevariation in the quantity of metal in the pot or outside influences.

A branch gas pi e 26 leads from pipe 19 to a burner (not s own) at thehead of the metal pot if desired for an auxiliary heater. Stop cocks 27,28, are provided to shut off the gas from either burner if desired.

A bracket 29 secured to the jacket supports the mercury tube.

In connecting up the ap aratus, the mercury tube 5 is inserted in t ebracket holder 29 and clamped by the set screw 30. Then the top portion8 of the governor is unscrewed and removed and the mercury is slowlypoured into the mercury tube through the 0 en top of the shell 6 untilit rises in the cliambered portion of the shell 6 to a point somewhatbelow the line 23 so-that when the up er shell 8 is screwed onto thelower shell the lower end of the adjusting tube 10 will be a littleabove the level of the meroury when there is no heat on. The upper shell8 is then screwed on to the lower shell. The adjusting tube 10 can thenbe turned to raise or lower it if necessary to bring the lower end ofthe tube to the proper height with relation to the level of the mercury.The gas tubes can then be connected and the gas turned on to allowpassage through the governor and tube to the burn ers. The gas is thenlighted, and after the metalis ,melted and heated to the requiredtemperature, if it is found that the metal is running either too hot ortoo cold, the tube 10 may be turned up or down as necessary to make therequired adjustment. When once adjusted the temperature of the moltenmetal will regulate the supply of gas so that the temperature .of themetal will remain almost constant and it will run continuously Withoutany re-adjustment by hand.

While I have described the invention as applied to use in connectionwith a lin'otype IIS machine, it is obvious that it is adapted for andintermediate ports and passages to the tube 19, and instead of a gasburner at the end of the tube 10, the hot steam could be projectedagainst the pot.

I claim as my invention:

1. In a linotype machine or kindred ma chine, the herein describedapparatus for automatically controlling the temperature of'the moltenmetal for casting type, said apparatus comprising a melting pot, a tubecontaining mercury extending down into the interior of the melting potand immersed in the molten metal in the pot, a chambered head with whichthe upper end of said mercury tube is connected, said head bein formedwith two chambers and provide with a passage connecting said twochambers, said mercury tube entering into the lower one of saidchambers, a hollow adjustable tube closed at its upper'end and open atits lower end and extending through the upper chamber in said head andthrough said connecting (passage between the chambers and into sai lowerchamber, said adjustable tube being provided with a slit in the sidethereof extending from the lower end some distance upward, a gas supplytube leading into said upper chamber, said adjustable tube beingprovided with a port which leads from said upper chamber into theinterior of said adjustable tube, whereby the gas may pass from saidfeed tube through the upper chamber and adjustable tube into the lowerchamber, said adjustable tube filling the passage between said chambersand cutting off communicationbetween them exce t through said tube andport, a gas burner tu e leading from said lower chamber and a gas burnerconnected with said burner tubein proximity to said melting pot, wherebythe temperature of the molten metal controls the rising and falling ofthe mercury and thereby regulates the amount of gas passin through theburner. 2. In a linotype mac e or kindred machine, the herein describedapparatus for automatically controlling the temperature of the moltenmetal for casting type, said apparatus comprising a meltin pot, a tubecontaining mercu extending down into the interior of the me ting pot andimmersed in the molten metal in the pot, a chambered head with which theupper end of said mercury tube is connecte formed with two chambers andprovided with a passage coimecting said two chambers, said mercur tubeentering into the lower one or said 0 iambers, a hollow adjustable tubeclosed at its upper end and 0 en at its lower end and extending throuthe upper chamber in said head and through said connecting passagebetween the chambers and into said lower chamber, said adjustable tubebeing provided with a slit in the side thereof extending from the lowerend some distance upward, a gas supply tube leadin into said upperchamber, said adjustable tu e being provided with a port which leadsfrom said u er chamber into the interior of said adjusta ble tube,whereby the gas may pass said head being 1 from said feed tube throughthe upper chamber and adjustable tube into the lower chamber, saidadjustable tube filling the passage between said chambers and cuttingoff communication between them except through said tube and port, a gasburner tube leading from said lower chamber and a gas burner connectedwith said burner tube in proximity to said melting pot, whereby thetemperature of the molten metal controls the rising and falling of themercury and thereby regulates the amount of gas passing through theburner, said head comprising two shells havin screw threaded connectionwith each 0t er, one of which is formed with a passage through which themercury tube enters the mercury chamber, and the other of which whichthe adjustable tube enters the head, said head being formed with nippleson the is formed with a threaded passage through side connected withsaid chambers and adapt-

